The Sunday Express tends to use Collins as its source & the definition of 'bulgUr' is exactly as shown in the clue, while 'bulgAr' has no wheaty connection
I can't believe this, but I put 'bulgur' first, thought it didn't look right and changed it to 'bulgar', and you should see what the crossword looks like now that I've changed it back again! I too put 'agents' instead of 'agency', so thanks for the help with 35A, all you clever people! (I really must start photocopying the grid, so I can do a draft first!)